Typo3 Fluid detect Links in Text - hyperlink

Question

This Code is showing a Textarea Input from the Backend in my Frontend:
<f:format.nl2br>{data.textfield}</f:format.nl2br>
Its possible there are Links in it as simple text for example:
http://www.example.com
Is it possible somehow to detect those links and wrap a linktag around it with Typo3 6 and Fluid?
Its rather easy in Javascript but if possible I prefer a Typo3/Fluid solution here.

Answer 1

why dont you use the RTE for your Textfield in the Backend and render it in Fluid with
<f:format.html>{data.textfield}</f:format.html>
If you do it like this, you have your line breaks rendered and all the Links, too. You enable the RTE features in your TCA-Configuration:
'textarea' => array(
'exclude' => 0,
'label' => 'your_label_from_locallang.xlf',
'config' => array(
'type' => 'text',
'cols' => 40,
'rows' => 15
),
'defaultExtras' => 'richtext[]'
),

Answer 2

Is the fluid used in context of an extension? If so make the check on php side and bind a boolean value to the view. You can then use something like this:
<f:if condition="isLink">
<f:then>
<f:link.external uri="{data.textfield}" target="_blank">{data.textfield}</f:link.external>
</f:then>
<f:else>
<f:format.nl2br>{data.textfield}</f:format.nl2br>
</f:else>
</f:if>
Unfortunately condition is very limited in what it can check on fluid side only so this won't help if you can't use php.
Another possibility would be to create a ViewHelper for that.